4 Suggested Answers

FILLING THE WATER TANKS
1. Before filling the water tanks, push the POWER switch to the “OFF” position and
unplug unit. Refer to cleaning instructions.
2. Remove water tanks from base, turn each tank upside down and remove tank cap
by turning counterclockwise. Fill tank with clean cold tap water.
Replace the tank cap by turning clockwise. Tighten firmly.
3. Carefully pick up tank, since it will be heavy when full, and slippery if wet.
4. Place water tanks on base. Make sure tanks are properly placed, otherwise, the
humidifier will not work correctly.

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If you're asking how to clean the inner workings of the humidifier ... Run a 50/50 solution of White Vinegar and Water through it. Then flush it with Bottled Distilled Water. As a matter of fact, using Bottled Distilled Water all the time, will cut down on having to clean the unit as often. Distilled water has no minerals and will not produce scale, like tap water.

the rusted sensors are the cause of your problem - as soon as the sensors do not conduct an electric current through the water (either because there is no water or because they have decayed), the humidifier shuts itself off. You will need to replace the sensors.
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FILLING THE WATER TANKS
1. Before filling the water tanks, push the POWER switch to the “OFF” position and
unplug unit. Refer to cleaning instructions.
2. Remove water tanks from base, turn each tank upside down and remove tank cap
by turning counterclockwise. Fill tank with clean cold tap water.
Replace the tank cap by turning clockwise. Tighten firmly.
3. Carefully pick up tank, since it will be heavy when full, and slippery if wet.
4. Place water tanks on base. Make sure tanks are properly placed, otherwise, the
humidifier will not work correctly.

Mine did the same thing at the end of last winter. I did not discover it to be one of the rubber tubes (boots as you say) until I went to use it this past fall. The manuf. said send it back for a replacement (they do not fix these or offer parts) which I did in Nov. and still have not received the replacement. Nice deal for them.

My Slant Fin humidifier has a floating, ring-shaped magnetic level that isn't replaceable. You can't even tell it's magnetic until you cut off the piece that prevents the white plastic float from rising past a certain point. It turns out that there is a ring-shaped magnet in the float.

I found that the Refill light would go off when I held a strong magnet near the float device.

So, I have suspended the magnet with string from the top of the humidifier outside the humidifier.

Caution: This fix disables the safety feature inherent in the low level shut off. I wonder why the manufacturer uses material that corrodes?

This sounds like the float switch may be stuck - giving an error message - usually these are not too hard to unstick - it is often a cleaning issue - the manual should show you where the float switch is and how to check it, but if the error message is not listed in the manual, if you are sure it is the correct manual then I would expect it to be a technicians job, else they would list the error message.
Slant/Fin has sold the humidifier and PC-55
air purifier business to KAZ USA Inc.
If you need replacement parts, repairs, or have any questions
regarding the products, please contact them at:
KAZ, Consumer Relations Dept.
250 Turnpike rd., Southborough, MA 01772
Phone: 800-477-0457
email: info@kaz.com
also worth a look is:
http://www.achooallergy.com/slantfin-ope...
seems to be best forum for humidifier stuff
Hope this helps
:)

Slant/Fin has sold the humidifier and PC-55
air purifier business to KAZ USA Inc.
If you need replacement parts, repairs, or have any questions
regarding the products, please contact them at:
KAZ, Consumer Relations Dept.
250 Turnpike rd., Southborough, MA 01772
Phone: 800-477-0457
email: info@kaz.com
also worth a look is:
http://www.achooallergy.com/slantfin-operating-instructions.asp
seems to be best forum for humidifier stuff